Great topic - I'm going to have some fun with this one - hopefully I don't say too much either....
Thoughts:
1. It's hard to expect any ONE network to make you uber successful, though it IS possible, and it IS in all of their best interest - however many try to make you exclusive for that very reason - not to dilute the offer/create competition for themeselves... I think if ONE network can outperform all the others (let's say you were with five of them) by a long shot - it would absolutely make sense to go exclusive - however 'putting all your eggs in one basket' is risky, and rarely provides longevity.
2. I have clients who have duplicated sites/systems that are on both - affiliate networks, and go through CPA's/specialists, and have in-house... << This can get really messy however it also provides a HUGE split test for any vendor as they can eliminate the poorest performers/matches and focus on narrowing in on the top converters.
3. While it does give you access to different pools of affiliates, each scenario/network/specialist works differently to some extent. Each have a different way of reaching their database with your offer, some have none, yet the aff pools are much larger and recruitment is a piece of cake... It all comes down to that snowball effect imo - If your offers proves to be a good converting product - they will find you, and rather quickly I might add. I think it's great to see these networks and providers now being pro-active in looking for good offers to bring into their slate, it's about time
4. Depending on how you are setup - you may have to duplicate your site as some providers require a standalone gateway/payment process and having a landing page within your site - with a different domain pointing to it is not enough.
5. It greatly depends on whether you are a digital product or a tangible - obviously digital products can usually offer a higher payout - and therefore have access to digital product aff networks that are all going huge these days...
6. When you are with multiple networks, it will obviously come with SOOO much more analytics and data that you (can) analyze. Each network/provider you work with, you should setup tracking on those pages to monitor what they do - if you are a new vendor you really should do this - you'd be surprized how much you can tell about a networks traffic with simple analytics - we can usually tell if the network will perform or not rather quickly by doing this... Anyway the point of this one is a bigger need for analytics and data mining - which can indeed prove very profitable when testing many networks.
At the end of the day I think 'yes' and 'no' apply here - if you can find a network that blows everyones socks off with your offer - yes it's worth sticking to one and even paying to manage your program. If you have only tried one program and it does not par up to your expectations, yes you should try others - if none perform - it could be the offer or the price or or or - however when one finally starts converting it, pay attention and analyze 'why' they are indeed converting... then duplicate efforts or find complimentary providers.
Personal thought: I have networks/people approach me often with great claims "we say no to 98% of our applicants" and "we never ever ever send wonky or untargeted traffic" or "we have the best of the best of the SA's in our pool" - we give most a shot however the pitch 'usually' outdoes any results we see, so take claims lightly just look at any network as a potential doorway to testing grounds.
From the post above:
"From affiliate point of view its good because affiliates can select the highest payout for a particular offer in different networks."
**This is actually a big nono - from a vendors perspective it is not admirable to offer network x 50% and network y 40% - most networks would laugh at that, it is important to have an equal opportunity with all the networks. From an affiliates point of view - it has little to do with which network is paying more for the same offer as that rarely if ever happens (In fact vendors can get fined by the networks if they are caught doing this)... it has to do with which network offers the best analytics on top of your own, how their cookies (length) are set/served, what type of mining you can do re conversion tracking, what networks receive creatives first, and my personal fav - what networks have the most current and quickest 'no hassle' payout.
Cheers,
Norb.